AcOH	Acetic acid
Alys	Azidolysine
CA	Contrast agent
CT	Computed tomography
CuAAC	Copper-catalyzed azide–alkyne [3+2]-cycloaddition
DCC	N,N′-Dicyclohexylcarbodiimide
DCE	Dichloroethane
DCM	Dichloromethane
DDQ	2,3-dichloro-5,6-dicyano-1,4-benzoquinone
DH	Hydrodynamic diameter
DIBO	Dibenzocyclooctyne
DIBO-NH2	Amino-modified dibenzocyclooctyne
DIPEA	Diisopropylethylamine
DLS	Dynamic light scattering
DMAc	N,N-Dimethylacetamide
DMF	N,N-Dimethylformamide
DMSO	Dimethylsulfoxide
EDX	Energy-dispersive X-ray spectroscopy
FCC	Flash column chromatography
FHG	Fourth harmonic generation
FTIR	Fourier transform infrared
IR	Infrared
Hex	Hexane
HNP	Harmonic nanoparticle
Ln	Lanthanide
LNO	Lithium niobate
MR	Magnetic resonance
MRI	Magnetic resonance imaging
MWCO	Molecular weight cut-off
NHS	N-Hydroxy succinimide
NIR	Near-infrared
NP	Nanoparticle
NPCF	Nitrophenyl chloroformate
PBS	Phosphate buffer saline
PDI	Polydispersity index
PEG	Poly(ethylene glycol)
PET	Positron emission tomography
PL	Photoluminescence
PMBBr	p-methoxybenzylbromide
Py	Pyridine
rt	Room temperature
SHG	Second-harmonic generation
SPAAC	Strain-promoted azide–alkyne [3+2]-cycloaddition
SPECT	Single-photon emission computed tomography
STEM	Scanning transmission electron microscopy
TACNB	1,4-bipicolinate-1,4,7-triazacyclononane
Talys	Tri-azidolysine peptide
TEA	Triethylamine
THF	Tetrahydrofuran
THG	Third-harmonic generation
TLC	Thin-layer chromatography
Tol	Toluene
UV	Ultraviolet
Vis	Visible
ZP	Zeta potential